描述
2磨削機(jī)PLC控制系統(tǒng)的硬件設(shè)計(jì)
2.1磨削機(jī)設(shè)備組成及設(shè)計(jì)目標(biāo)
磨削機(jī)主要由1臺(tái)永宏FBs-44MN系列PLC,1套三菱MR-J2S系列交流伺服系統(tǒng),3臺(tái)三菱FR-E540系列變頻器,1臺(tái)WEINVIEW的510T,1個(gè)4DA模塊組成。其核心是可編程控制器,它的輸出部分主要用于控制伺服和驅(qū)動(dòng)電機(jī)。其輸人部分主要接收各類保護(hù)繼電器的動(dòng)作信號(hào)。整個(gè)設(shè)計(jì)具體可分為以下4部分:①采用PLC:FBs-44MN完成檢測(cè)(計(jì)算出最佳的進(jìn)刀量),自動(dòng)磨削等工序。②利用伺服實(shí)現(xiàn)對(duì)磨削進(jìn)刀量的雙閉環(huán)控制。③利用內(nèi)部計(jì)數(shù)器和光電開關(guān)讀取橫向拖板移動(dòng)距離。④采用觸摸屏實(shí)現(xiàn)了更為方便、友好的人機(jī)通訊。
2.2PLC控制系統(tǒng)構(gòu)成
控制系統(tǒng)由可編程邏輯控制器FBs-44MN、伺服、光電接近開關(guān)和D/A擴(kuò)展模塊以及觸摸屏元件組成,實(shí)現(xiàn)磨削過程中基本邏輯動(dòng)作、檢測(cè)、伺服閉環(huán)控制和人機(jī)通訊四大功能
1)伺服和定位控制器的結(jié)合模塊:磨削機(jī)要求絲杠上的刀盤在加工前后必須停拖板電機(jī)在相同的位置,以便下一加工循環(huán),否則將造成刀具或工件損壞。準(zhǔn)確定位在普通繼電器控制的鼠籠式交流電機(jī)上實(shí)現(xiàn)起來比較麻煩,我們采取伺服系統(tǒng)來實(shí)現(xiàn)定位,引人速度負(fù)反饋消除了外界參數(shù)變化和擾動(dòng)對(duì)系統(tǒng)狀態(tài)的影響,使該系統(tǒng)具有動(dòng)態(tài)響應(yīng)快、定位精度高、系統(tǒng)穩(wěn)定性好等特點(diǎn)。為了在工作過程中使精度控制在規(guī)定的誤差以內(nèi),進(jìn)刀距離通過檢測(cè)采用閉環(huán)跟蹤控制。首先是用FBs-44MN讀取檢測(cè)時(shí)探頭接觸版輥的讀數(shù),并根據(jù)公式顯示版輥的直徑最大,最小,平均值(與制定合適的切削量有關(guān)),然后用此時(shí)的伺服讀數(shù)減去探頭讀數(shù),再加上需要的切削量求出比較精確的進(jìn)刀量,最后開始整個(gè)自動(dòng)磨削過程。FBs-44MN作為智能化的定位控制器按用戶編制的定位程序向驅(qū)動(dòng)器發(fā)出定位脈沖、運(yùn)行方向等,信號(hào)驅(qū)動(dòng)器按這些控制信號(hào)驅(qū)動(dòng)伺服電機(jī)帶動(dòng)滾珠絲杠進(jìn)行定位,對(duì)于伺服電機(jī),有伺服準(zhǔn)備、伺服結(jié)束和零位三個(gè)信號(hào)反饋,外部設(shè)定用數(shù)字開關(guān)可將定位點(diǎn)位置和速度等數(shù)值送人定位單元,定位單元通過總線連接到FX系列PLC擴(kuò)展口上,成為PLC控制系統(tǒng)中的定位智能控制環(huán)節(jié),在定位單元內(nèi),常量的設(shè)置與監(jiān)控、參數(shù)的改變可以通過使用連接到PLC上的數(shù)據(jù)存取單元完成,因此可以在運(yùn)行過程中由PLC指定模塊號(hào)(這里4DA是1號(hào)模塊),傳送定位速度等數(shù)據(jù),并能在PLC中監(jiān)視GM的實(shí)時(shí)定位信號(hào)及運(yùn)行或停止?fàn)顟B(tài)。相應(yīng)地在PLC中分配有輸人繼電器,輸出繼電器,輔助繼電器,以及特殊輔助繼電器等設(shè)備。
歐美品牌停產(chǎn)的,常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域:
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動(dòng)化控制系列
本特利,英維思,伍德沃德,??怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。
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